ISFSI Only: An Independent Spent Fuel Storage Installation used to temporarily stor spent nuclear fuel. ISFSI Only is defined as a plant license that only permits spent nuclear fuel storage.

DECON: DECONN is defined as the immediate dismantlement of the facility soon after it closes. Equipment, structures, and portions of the facility containing radioactive contaminants are removed or decontaminated to a level that permits release of the property and termination of the NRC license.

SAFSTOR: SAFSTOR is considered to be “delayed DECON”. A nuclear facility is maintained and monitored in a condition that allows the radioactivity to decay; afterwards, it is dismantled and the property decontaminated.